After research I thought I had diagnosed my 4x4 issue. It would go into 4 wheel drive, then after a few seconds/driving a short distance, there would be a pop and the truck would stop, then it wouldn't move until i put it back in 2. Also doesn't blow very hard out of the vents in the truck, which after reading lead me to believe it was the transfer case input shaft seal. I can see atf fluid leaking from what I think is the input seal, so I pulled off the drive shaft connected to it, but the seal looks good? Although there was a bunch of mud crammed in there. Also not sure how to get the seal out, if I do indeed need to drop the transfer case? I've included a picture of the seal and where it was leaking from. It's the front end drive shaft, assumed that was "input."

 

Derp. 1995 2 door blazer, manual floor shift 4x4.

 

First of all, the transfer case input shaft is between the transfer case and the transmission. You can't see it without separating the two parts.

The shaft you show is the front output shaft, and it appears that the seal is leaking. Check for radial play in the shaft. You could have a bad bearing, as well.

 

Thanks, after reading some more I was coming to that conclusion. I could move the drive shaft back and forth slightly where it connects in the picture before I took it off, but it seemed to spin smoothly. Is the pictured seal something that just pops out? And the bearing....should it be bad, can that be replaced without actually tearing apart the transfer case itself? I'm just trying to get out of the money pit this thing has put me in, and it just keeps getting worse lol. Parked it because I wasn't sure it was safe to drive without causing more damage, otherwise I'd just sell it as is.

 

The seal is fairly easy to replace, once you pull off the shaft (which you've already done). Just carefully pry out the old one and tap a new one in, being careful to drive it in straight and not damage it. I don't believe the bearing can be replaced without disassembly, but it's probably still good. It might be helpful to drain the fluid first. Otherwise, you're going to lose some when you remove the seal. You want the seal area to be clean and dry when you install the seal (other than a little grease on the rubber seal lip).

 

Thank you, I've got at least a few weeks of free time to work on it and learn what the heck I'm doing =) For such a seemingly common problem I was hoping to find a video somewhere, guess I'll just start taking things apart and hope for the best lol.